ML19350E881

Final Deficiency Rept Re Incorrectly Ordered Throttling Valves for RHR Sys,Initially Reported 800912.Deficiency Found Reportable.Constructor Is Tracking Deficiency & Verifying Corrective Actions

ML19350E881
Person / Time
Site:	Grand Gulf
Issue date:	06/15/1981
From:	Mcgaughy J MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, AECM-81-196, NUDOCS 8106230614
Download: ML19350E881 (5)

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F-MISSISSIPPI POWER & LIGHT COMPANY

))l Helping Build Mississippi Edhhlbliidd5 P. O. B O X 1640. J A C K S O N. MIS SIS SIP PI 3 9 2 0 5 i

1. g/%T},f,R June 15, 1981 Of fice of Inspection & Enforcement U. S. Nuclear Regulatory Commission Region II )

101 Marietta Street, N.W.  ;

Suite 3100  ;

Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Director ,

SUBJECT:

Grand Gulf Nuclear Statiod Units 1 and 2 Docket Mos. 50-416/417 File 0260/15525/15526 PRD-80/58, Final Report Incorrectly Ordered Throttlieg Valves AECM-81/196

References:

1) AECM-80/253, 10/13/80 , ,

2) AECM-81/46, 1/23/81 On September 12, 1980, Mississippi Power & Light Company notified Mr. M.

Hunt, of your office, of a Potentially Reportable Deficiency (PRD) at the Grand Gulf Nuclear Station (GGNS) construction site. The deficiency concerned .

incorrectly ordered throttling valves for the Residual Heat Removal System (E12) and the Low Pressure Core Spray System (E21). As a result of additional investigative efforts on the part of our Constructor, the Reactor Water Cleanup System (G33) and the Fuel Pool Cooling and Cleanup System (G41) have also been shown to be involved.

This deficiency has been determined to be reportable per 10CFR50.55(e) but not under the provisions of 10CFR21 as these valves had not been turned over to MP&L. Our Constructor has issued MCAR-99 to track this deficiency and to verify ccapletica of corrective actions.

Attached is our final report.

Yours truly,

); 'A Y y J. P. McGaughy, Jr.

KDS:dr ATTACHMENT cc: See page 2 f 8106 23 0 tel9 Member Middie South utiiities System i - -

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Mr. J.'P. O'Railly AFCM-81/196

- NRC - Page 2

- cc: ' Mr.-N.:L. Staaplay Mr. R.-B. McGehee..

- Mr. T. B. Conner- .

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- Mr. Victor Stello,. Director _ ,

' Office 'of Inspection & Enforcement U. S. Nuclear Regulatory Commission

- Washington, D.C.-20555 Mr. G. B. Taylor.. -

South Miss.- Electric Power Association P. O. Box 1539

. Hattiesburg, MS 39401 -

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- Mr. R. A. Ambrosino .

-Mr. R. C. Fron Mr. G. B. Rogers Mr. M. R. Williams Mr. L. E. Ruhland Mr. D. L. Hunt -

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. . ATTACHMENT A to AECM 81/196

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- FINAL REPORT FOR PRD-30/58 I.. Description of the Deficiency Valves for the Low Pressure Core Spray System (E21), the Residual Heat Removal System-(E12), the Reactor Water Cleanup System (G33)' and the Fuel l Pool Cooling and Cleanup System (G41) were incorrectly purchased as shut-off valves. These valves were shown to be throttling valves in the i system design. ,

This deficiency applice to both Uait I and Unit 2.

The extent of the deficiency is limited to motor operated valves supplied

~ by our Constructor in systems designed by our NSSS supplier. .

The cause of the deficiency may have been contributed to by the following:

(1) The need to verify capability of a globe valve for actual throttling conditions was not recognized as it is commonly believed that any globe valve is also a throttling valve. (NOTE: The globe valves furnished en Grand Gulf are unique in that the valves have flexible discs, not suitable for significant differential pressures.)

(2) - Failure to fully implement NSSS supplier specified design requiretents.

(3) Failure of our NSSS supplier to specify or claarly state the -

throttling requirements for valves furnished by others for use in their designed systems. -

II. Analysis-of Safety Implications The initial valve identified was valve Q1E21F012 in the Low Pressure Core

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3 pray System (LPCS). Extensive throttling of this valve could result in valve damage to the extent that the valve would not assume its safety a

position (closed). The intended function of the LPCS System could be compromised during a safe shutdown mode.

Subsequently, eleven (11) additional valves were identified as having been incorrectly ordered as shut-off valves rather than throttling valves.

Because of the generic nature of this deficiency, it is reportable under 10C"R50.55(e).

None of the affected valves have been turned over to MP&L for acceptance, so this deficiency is not reportable under the provisions of 10CFR21.

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' *~E* ATTACHMENT A to AECM-81/196

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III. Corrective Action Taken It has been concluded that the extent of the deficiency sas limited to motor operated valves supplied by our Constructor in systems designed by - l our NSSS supplier. 1 Subsequent discussions between our Constructor, NSSS supplier, and the -

valve manufacturer resulted in the following resolution of the problem.

Nine (9) valves (Q1E21F012, Q1E12F053A&B, Q1E12F021, Q1E12F048A&B, Q1G33F044, Q1G41F021, and Q1G41F043) have been modified by the manufacturer to provide a throttling capability. ,

Two (2) valves (Q1E12F037A&B) have been determined to te capable of -

performing their throttling functions without modification.

One (1) valve (Q1E12F023) has subsequently been determined b[ our NSSS supplier to have no throttling function, although it was originally specified to be a throttling valve.

To prevent future recurrence cf the deficiency, our Constructor has issued revisions to the purchase specification to identify those valves requiring a throttling capability to perform their intended function.

These revisions will correct the deficiency for Unit 2.

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